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Vishay General Semiconductor - Diodes Division SMBJ78AHE3/52
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- Part No.:
- SMBJ78AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78AHE3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,419
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Product details
Overview
SMBJ78AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 126 V maximum clamping voltage (VC) at 4.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power electronics, industrial sensor interfaces, and telecom front-end protection.
For engineers reviewing the SMBJ78AHE3/52 datasheet, SMBJ78AHE3/52 pinout, SMBJ78AHE3/52 application, or SMBJ78AHE3/52 equivalent, this device delivers AEC-Q101 qualification, low incremental surge resistance, fast sub-nanosecond response time, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and lightning surge suppression in harsh environments.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 78 V), then rapidly avalanches to clamp transients above its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and long-term reliability across -55 °C to +150 °C junction temperature range.
The SMBJ78AHE3/52 uses a single PN junction with cathode-band polarity marking, optimized for automated SMT placement on 0.2" × 0.2" copper pads. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling effective power dissipation during repetitive 0.01% duty-cycle surges without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 72–80 V systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Tight breakdown window ensures predictable turn-on and avoids false triggering near nominal rail. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage limits downstream IC stress during 600 W transient events (10/1000 µs). |
| PPPM | 600 W - Peak pulse power handling capacity per single transient event; validated per ANSI/IEEE C62.35. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine), supporting inrush and fault-current scenarios. |
| TJ max. | +150 °C - Maximum junction temperature enables operation in under-hood automotive or enclosed industrial enclosures. |
| MSL Level | Level 1 (J-STD-020) - No floor life limitation; supports standard reflow without baking prior to assembly. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected line's lower-potential side (e.g., GND or negative rail); completes clamping loop during overvoltage. |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line's higher-potential side (e.g., +78 V rail); avalanche conduction initiates here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment modules. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping - critical for protecting 80 V-rated MOSFETs and gate drivers in 48 V systems. |
| MSL Level 1 & RoHS-compliant | Enables direct placement into high-volume SMT lines without moisture sensitivity concerns or lead-free compliance barriers. |
| Fast response time (<1 ns) | Clamps ESD transients (IEC 61000-4-2 ±8 kV contact) before sensitive logic or analog circuitry sustains damage. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Shunt TVS placed between 48 V rail and chassis ground to clamp spikes up to 120 V within nanoseconds. Use Value: Prevents latch-up or gate oxide rupture in buck controllers and CAN transceivers exposed to >100 V transients. |
Use Scenario: Safeguarding 24 V analog input channels of PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Unidirectional clamping element on sensor supply line, coordinated with series ferrite and RC filter. Use Value: Maintains signal integrity while limiting transient energy to <10 mJ - preserving 16-bit ADC accuracy and isolation barrier integrity. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Secondary-side overvoltage suppression on -48 V telecom rectifier outputs feeding base station RF amplifiers. IC Role / Device Role / Timing Role: Standoff-rated TVS parallel to bulk capacitor, absorbing coupled lightning surges from AC mains or antenna ports. Use Value: Limits clamped voltage to 126 V - well below 150 V absolute max rating of GaN FETs and op-amps in RF bias chains. |
Use Scenario: Clamping Miller-induced voltage spikes on high-side gate driver supplies in 3-phase inverters. IC Role / Device Role / Timing Role: Localized TVS on isolated 15 V gate supply rail, placed adjacent to driver IC to minimize loop inductance. Use Value: Suppresses >100 V ringing events before they exceed gate oxide breakdown thresholds of SiC MOSFETs (typically 20–25 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AE3/52 | Commercial-grade (non-AEC-Q101); identical electrical specs but no automotive qualification testing. | Limited to non-automotive industrial or consumer use where extended temperature cycling and HTRB validation not required. | Select when cost sensitivity outweighs automotive reliability requirements and full AEC-Q101 traceability is unnecessary. |
| SMCJ78AHE3/52 | Same VWM/VBR/VC, but in larger SMC (DO-214AB) package with 1500 W PPPM and lower RθJA (60 °C/W). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint. | Choose when system-level surge tests exceed 600 W or thermal management requires lower junction rise per watt. |
Compared with SMBJ78AHE3/52, the SMBJ78AE3/52 offers identical clamping performance at lower cost but lacks automotive qualification, while the SMCJ78AHE3/52 trades compact SMB size for higher surge capacity and improved thermal dissipation - making each optimal for distinct mechanical and reliability constraints.
Availability
SMBJ78AHE3/52 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC feed protection requiring stable component supply, AEC-Q101 traceability, and consistent 78 V standoff performance across production lots.
Supply support for SMBJ78AHE3/52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-speed, high-energy transient suppression in automotive, industrial, and communications infrastructure - balancing compact size, repeatable clamping, and ruggedized packaging.
FAQ
What is the maximum clamping voltage of SMBJ78AHE3/52 and under what test condition?
The SMBJ78AHE3/52 has a maximum clamping voltage (VC) of 126 V, measured at a peak pulse current (IPPM) of 4.8 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMBJ78AHE3/52 suitable for bidirectional transient protection?
No, SMBJ78AHE3/52 is a unidirectional TVS diode, intended only for DC circuits with defined polarity. For bidirectional protection (e.g., AC lines or data buses), Vishay specifies the CA-suffix variant - such as SMBJ78CAHE3/52 - which provides symmetrical clamping in both directions and uses different breakdown and clamping parameters.
Does SMBJ78AHE3/52 require derating at elevated ambient temperatures?
Yes, SMBJ78AHE3/52 must be derated above 25 °C ambient per Figure 2 in the datasheet. Its peak pulse power capability decreases linearly: at 85 °C ambient, PPPM is reduced to approximately 420 W, and at 125 °C, it falls to ~270 W - requiring careful thermal design and layout verification for high-temperature deployments.
What does the "HE3" suffix indicate in SMBJ78AHE3/52?
The "HE3" suffix in SMBJ78AHE3/52 denotes RoHS-compliant construction with AEC-Q101 qualification - confirming that the device meets automotive-grade reliability standards including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) robustness per JESD22-A114.
Can SMBJ78AHE3/52 be used in parallel to increase surge current handling?
No - SMBJ78AHE3/52 should not be paralleled without external balancing resistors. Due to VBR tolerance (±5%), mismatched avalanche turn-on can cause current hogging, leading to premature failure of one device. For higher surge ratings, select the physically larger SMCJ78AHE3/52 instead.
SMBJ78AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ78AHE3/52 FAQ
1.How can I place an order for SMBJ78AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78AHE3/52 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMBJ78AHE3/52 reliable?
The price and inventory of SMBJ78AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78AHE3/52?
SMBJ78AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78AHE3/52 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMBJ78AHE3/52?
For technical support, including SMBJ78AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78AHE3/52 requirements.
6.How does Aetrix verify that SMBJ78AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78AHE3/52 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMBJ78AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78AHE3/52?
All SMBJ78AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78AHE3/52, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMBJ78AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ78AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78AHE3/52 Tags
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